Elevator interlocking device



T. W. JENKINS, DECD. J. A-JENKINS EXECUTRIX. ELEVATOR INTERLOCKING DEVICE. APPLICATION FILED JULY 13, 1918. 1,336,748, v Patented Apr. 13, 1920.

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J. A. JENKINS. EXECUTRIX. ElEVATOR INTERLOCKING DEVICE.

Patented Apr. 13, 1920.

APPLICATION FILED JULY 13, I918.

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I w/fmm UNITED STATES PATENT OFFICE.

TI-I JMAS W. JENKINS, 0F PHILADELPHIA, PENNSYLVANIA; JENNIE A. JENKINS EXECUTRIX OF SAID TI-ICIYIRS W. JENKINS, DECEASED.

ELEVATQB INTERLUCKING DEVICE.

Application filed July 13, 1913.

To all whom it may concern Be it known that I, THOMAS l/V. JENKINS, a citizen of the United States, residing at Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented a new and useful Improvement in Elevator Interlocking Devices, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to that class of mechanism known as safety stops for elevators by means of which the gates at the landings of the elevator shafts are locked in closed position and prevented from being opened at all times except when the elevator in the shaft has been brought to rest registering with a landing, in which case the gate of said landing is free to open. It also precludes the possibility of further operating the car until said gate has been closed again.

Such locking safety means is old and well known in the automatic elevator interlocking art, and a well known, simple means therefor will be described and illustrated in connection with my invention.

As a further step it is desirable, and in some States is even made mandatory by statute or by orders of elevator inspecting bureaus, that there be present, in connection with such locking means, an arrangement for rendering said means inoperative, upon occasion, by the elevator operator, whereby the car may be operated in the shaft while the gate is in open position.

The object of my invention is to provide this further means in connection with the car and gate locking mechanism, and comprises certain apparatus, located on the car within reach of the operator, whereby by pulling a lever the result will be accomplished.

I will now proceed to describe in detail a device embodying my invention, in connection with the accompanying drawings, in which Figure 1 is a vertical sectional view of an elevator in connection with a landing.

Fig. 2 is a section on line 22 of Fig. 1 showing in elevation the side of the elevator containing the operators handles.

Fig. 3 is a face view of the gate look at the landing.

Fig. 4: is a section on line 4- .1: of Fig. 5.

Specification of Letters Patent.

Patented Apr. 13, 1920.

Serial No. 244,680.

Fig. 5 is a plan view of the mechanism on line 55 of Fig. 4.

Fig. 6 is 'a section on line 66 of Fig. 5.

Fig. 7 is an enlarged detail view of a portion of the mechanism on the elevator.

Inside the elevator shaft, at each landing, there is a locking plate a carrying the locking mechanism for the gate at that landing. :12 represents the gate, 3 the floor of the elevator car and z the landing.

A bar 6, connected with the gate, extends downward over the face of plate a, where it engages a locking wheel 0 provided with a cam face (Z. The locking wheel is prevented from turning to free bar 6 and allow the gate to open, by a stop 6 on said wheel contacting with the toe f of a pivoted plate 9 normally held in the path of tl e stop by the action of a spring 72., see Figs. 3, l and 5.

Thus, the gate is locked in closed position at every landing in the shaft and a gate may be unlocked only when the elevator is brought to a stop in the shaft so that its floor registers with the landing or floor level of that gate.

Beneath the floor y of the elevator car there is a depending angle frame 2' which carries the device for unlatching the lock. A three-armed lever g is centrally pivoted to frame 6, one of whose arms operates a bolt in alinement with the portion of plate 5 on the locking plate that covers spring h. The opposite arm of lever Q operates a bolt Z; in alinement with a beveled cam plate at pivoted to the locking plate at n and;

adapted to be swung outward of the plate by cam (Z.

Bolt Z2 carries a beveled 'shoe 0 for contacting with cam piece m. Shoe 0 is carried on a short arm which is pivotally mounted at p to frame 2'. The outward movement of the shoe 0 is limited by an adjustable stop bolt so as to just clear cam plate m, which is held close against the locking plate by a spring 8.

A spring t between lever g and frame '5 acts to normally hold bolt 70 and shoe 0 out against stop a". In this position bolt j just clears the portion of plate 9 with which it alines, so that the elevator may pass up and down its shaft freely without acting upon any of the mechanisms upon plates (4 at the various landings.

The elevator operating wheel a is provided with an orifice o in its hub, so located that when said wheel is turned to stopped position orifice o is directly underneath and in vertical alinement with a rod to adapted to be entered therein.

Rod 'w extends downward through the floor y of the elevator and is actuated by a short arm 10 attached to a rock shaft 11 carried beneath said floor. Another arm 12 on this rock shaft is connected by a link 13 with the third arm of lever g carrying bolts j and t.

As described, the parts of the mechanism are so arranged that when the elevator is brought to a stop at a landing the gate may be opened as follows. By pushing the gate to the right, Figs. 1 and 3, locking wheel a is turned bringing cam face (Z down behind cam plate m. This turns the cam plate outward agaii st spring 8, and presses in shoe 0 and bolt 70, which in this position of the elevator are registering therewith. This turns lever 9' against the action of spring t and presses bolt j outward, which in turn contacts with pivoted plate 9 and turns it against the action of its spring h. In thus turning plate 9 its toe f is raised out of line with stop (2, allowing locking wheel 0 to continue turnirg so as to release bar I) of the gate and allow the latter to be freely opened.

In the tuining of lever Q the third arm, described as connected with link 13, turns rock shaft 1]". and this in turn moves rod w upward into the orifice 'v in the hub of the hand wheel a. This prevents turning of the operators wheel to move the elevator up or down and th refore prescribes that the elevator remain 3 stationary at this landing until the gate is closed to retract cam face 03 and allow lhe mechanism to return to its normal position.

It is seen lhat to allow of the foregoing operation the operators wheel must be very exactly brought to the stopped position in which rod on and orifice o are in alinement. Otherwise, the mechanism will lock and the gate cannot be opened.

In order t render this locking of the operators wheel inoperative, in emergency, the following mechanism has been added. A third short arm 14 is attached to rock shaft 11 and connected with a rod 15 which is extended vertically up through the floor of the elevator and into a glass-covered box 16, mounted on the side, within reach of the operator. Within this box, visible through the glass front, is a lever 17, the short arm of which is pivoted to the upper end of rod 15, and the longer, upstanding arm provides a handle by which the operator can nullify the effects of the locking mechanism previously described.

In the normal working of the elevator, when it is brought to stop at a landing and the gate opened, the rock shaft 11 is turned counter-clockwise in Fig.1, and rod 15 is pulled down slightly, tipping the handle of lever 17 toward the wall. If this were kept from so tipping backward, or were pulled forward by the operator, the rock shaft could not turn as described to press rod w upward into the orifice o in the hub of the operators wheel to hold it from being turned. Thus, the car could be manipulated while the gate is open.

As the rock shaft is thus kept from being turned to raise rod w, the three-armed lever 9 remains stationary or at least does not turn to press bolt j outward, and therefore this bolt does not project to interfere with any of the plates 9 at the various landings and prevent the free passage of the car. Similarly, bolt is not moved and therefore means is provided for keeping bolt is stationary and yet allowing cam face (Z to occupy its active position behind cam plate m, as it does while the gate is open.

This means consists of a spring 20 interposed between bolt la and shoe 0. The bolt may be recessed as shown in Fig. 7 and the shoe provided with a shank for entering the recess against the spring. Springs 13 and 21 therefore act against each other to normally hold lever g in central position with shoe 0 held pressed outward against its limiting stop 1". Spring 20 is stiff enough to insure that shoe 0 and bolt is normally act together to operate the locking devices described, but upon occasion the operator may break the glass of box 16, as with a convenient hammer 18 provided therefor, and pull upon handle 17 so as to compress spring 20 and allow the car to be operated.

Having now fully described my invention, what I claim and desire to protect by Letters Patent is:

1. The combination, with an elevator shaft containing a landing and a gate therefor, a car movable in the shaft and a controller in the car for governing its operation, of interlocking contrivances on the car and the shaft by which the gate is locked when the car is not opposite thereto and the controller is locked when the gate, the car being opposite thereto, is opened, the interlocking contrivance on the car comprising a spring which in the controller-locking operation positively transmits motion from one element to another, and a manually actuable emergency device operable, when the gate is open, to actuate part of the interlocking contrivance on the car to unlock the controller and compress the spring.

2. The combination, with an elevator shaft containing a landing and a gate therefor, of a turnable member, means on the gate adapted as the gate is moved from its closed position to turn the turnable member, a cam adapted to be moved into operative position by said turnable member, a shoe, carried by the car, adapted to be actuated by said cam,

a pivoted lever, a spring between said lever the cam is in operative relation with the and shoe, a link connecting said lever to a shoe, through the compression of said second pivoted lever, means adapted to lock spring. 10 the controller connected to said second lever, In testimony of Which invention I have and manually operable means, connected to hereunto set my hand at Philadelphia on said latter lever, whereby said controllerthis 20th day of June, 1918.

locking mechanism may be released, While THOMAS W. JENKINS. 

